Connecting the module TBX DES 1633
(Original Document)
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Circuit diagram
The following illustration shows the circuit diagram for a current sink input. 
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Guaranteed threshold for monitored voltage OK: > 36 V, guaranteed threshold for monitored voltage faulty: < 28 V.
Terminal block wiring
The following diagram illustrates the wiring of the terminal.
NOTE: it is not necessary to connect the two +IS terminals together, nor the two -IS terminals. The -SV terminal and a -IS (0 V) terminal must however be connected together.